Embodiments of the present disclosure relate to systems and methods for generating 3D models of floor plans using two-dimensional (2D) image inputs. According to an embodiment, a three-dimensional building model generation system is disclosed that can include a two-dimensional image receive module to receive a 2D image pertaining to the floor plan, an image processing module to processes the two-dimensional image to generate a binary image, a two-dimensional floor plan graph generation module to extract two-dimensional geometry from the binary image to generate a two-dimensional floor plan graph, and a three-dimensional model generation module to generate a 3D model of the floor plan by performing geometric extrusion of the two-dimensional floor plan graph based on one or more cyclic wall graphs and one or more connectives.